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Re: Validity periods can be handled more explicitly


At 02:25 PM 11/6/97 -0500, Robert Hettinga wrote:
>At 2:25 pm -0500 on 11/5/97, Carl Ellison wrote:
>> I would worry about any system being designed to handle the purchase of 
>> tankers between networked parties.  We're worried today about buying $0.25
>> photographs, $15 CDs, etc.  I'm quite content to let purchasers of oil
>> tankers fly to a meeting place and conduct business in the flesh.
>Yes, but what about an oil tanker's worth of currency derivatives? In
>bearer form?  Several trillion dollars of currencies are traded every day,
>for instance, usually between people who don't really know each other, and
>without too much premeditation. Certainly the net's eventually going to be
>the cheapest way to make those trades, and those of other financial

>Be careful what you leave out, folks. It may come back to haunt you later.
>Fortunately, I think what's happened here so far won't have that problem.

I didn't mean to say that SPKI would leave out folks buying either oil 
tankers or bearer currency derivatives.  For such cases -- like for any 
other heavy contract -- we propose what I frequently call a "locator 
certificate".  That is, you might want a certificate from an issuer who 
claims to be able to locate a given person in the event of fraud, up to a 
given future date, for the purpose of serving papers on him (or sending the 
cops after him).  Such a service would be performed for a fee, of course, 
but the certificate would stand for that isseur's promise to perform the 
service (or cover the cost of the fraud, if the issuer fails).

It's just the one-size-fits-all certificate I object to -- especially when 
it has something meaningless in it like a global name.

 - Carl

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